Waterproof concrete and process of making the same.



UNITED STATES sad PATENT OFFICE.

RICHARD K. MEAIDE, OF ROLAND PARK, MARYLAND.

WATERPROOF CONCRETE AND PROCESS OF MAKING THE SAME.

No Drawing.

T 0 all whom it may concern Be it known that I, RICHARD K. MEADE, acitizen of the United States, residing at Roland Park, in the county ofBaltimore and State of Maryland, have invented certain new and usefulImprovements in \Vaterproof Concrete and Processes of Making the Same,of which the following is a specification.

This invention relates to water-proof concrete, cement mortar,artificial stone and the like and has particular reference to animproved method of imparting water-proofing qualities to cement so thatsuch cement when made into concrete or the like will be impervious towater.

Heretofore, many attempts have been made to render concrete water-proofby mixing therewith various oils and various combinations offats, oilsand waxes with alkaline earth and other metals, such for example ascalcium oleate or stearate, but such combinations have not been whollysatisfactory.

I have discovered that permanently waterproof concrete can be producedby adding to the ce j pt a powdered filler, the particles of whi 31 1 .1coated with a thin coating or film of oil, preferably a mineral oil,such for example, as kerosene or other oil comprising one or moremembers of the paraifin series, or melted parafiin.

The filler may be any finely powdered substance which will not attack ordisintegrate the concrete, such for example as hydrated lime clay,powdered shale or the The particles of the filler may be provided with aiilln of oil in any suitable manner, as by pro|onged mixing or rubbingthe oil and filler together.

The quantity of oil employed is such that no oil will be apparent in theconcrete, the oil being present in the form of an extremely thin coatingor film on the particles of the filler, such coating or film beingpreferably so thin that the filler will not be ren- Specification ofLetters Patent.

Patented Apr. 14, 1914.

Application filed February 10, 1912. Serial N 0. 676,754.

dered noticeably plastic or sticky thereby.

The amount of oil required to provide a film on the particles of thefiller, as hereinbefore described, depends upon the fineness of suchparticles and consequently upon the surface exposed thereby. hydratedlime, the particles of which are extremely minute, I prefer to employfrom 30 to per cent. by weight of oil.

The filler is added to the cement in any desired proportion, the bestresults being ordinarily obtained by the addition of from 5 to 10 percent. of the filler.

It is to be understood that I do not claim to be the first to produceconcrete having an oil, fat, wax or the like incorporated therein, myinvention consisting in the addition to cement of a filler made up ofminute particles coated with a film of oleaginous matter, preferablyeral oil. su ch for exo ne o r; more m en'ib ers of araiiin serl W hileI have described in detail the specific reagents which I prefer toemploy and the proportions in which I prefer to mix them, it is to beunderstood that chemical equivalents may be employed and that theproportions may be widely varied without departing from the spirit of myinvention or the scope of the subjoined claims.

Having thus described my invention, I claim 1. The process of renderingconcrete water-proof, which consists in mixing therewith a powderedfiller, the particles of T which are coated with an oleaginous film,such film being so thin that the filler is riot rendered noticeablyplastic or sticky thereby.

2. The process of rendering concrete water-proof, which consists inmixing therewith a powdered filler, the particles of which are coatedwith a thin film of mineral In the case of? aa cam oil, the film beingso thin that the filler is not rendered noticeably plastic or stickythereby.

3. The herein described concrete composition comprising cementitiousmaterial and thin that the filler is not rendered noticeably plastic orsticky thereby.

In testimony whereof I aflix my signature in presence of two witnesses.

' RICHARD K. MEADE.

sition comprising cementitious material and Witnesses: a filler made upof small particles coated W. M. REIGHE, with a film of mineral oil, thefilm being so HELEN C. MOHR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

